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我想聯繫4個表。任務,任務問題,問題和選項。續集 - 將4個表聯繫起來
我的型號如下
任務模式:
var Sequelize = require('sequelize');
module.exports = function(sequelize, DataTypes) {
var Task = sequelize.define('Task', {
task_id: {
type: Sequelize.STRING,
primaryKey: true
},
task_name: {
type: Sequelize.STRING,
allowNull: true
},
task_description: {
type: Sequelize.STRING,
allowNull: true
}
},{
classMethods: {
associate: function(models) {
Task.belongsToMany(models.Question, {
through: {
model: models.TaskQuestion
},
foreignKey: 'task_id'
})
}
}
});
return Task;
};
TaskQuestions型號:
var Sequelize = require('sequelize');
module.exports = function(sequelize, DataTypes) {
var TaskQuestion = sequelize.define('TaskQuestion', {
tq_id: {
type: Sequelize.STRING,
primaryKey: true
}
});
return TaskQuestion;
};
問題型號:
var Sequelize = require('sequelize');
module.exports = function(sequelize, DataTypes) {
var Question = sequelize.define('Question', {
question_id: {
type: Sequelize.STRING,
primaryKey: true
},
question_description: {
type: Sequelize.STRING,
allowNull: true
},
question_type: {
type: Sequelize.STRING,
allowNull: true
}
},{
classMethods: {
associate: function(models) {
Question.hasMany(models.Option, {
foreignKey: {
name: 'question_id',
allowNull: false
}
}),
Question.belongsToMany(models.Task, {
through: {
model: models.TaskQuestion
},
foreignKey: 'question_id'
})
}
}
});
return Question;
};
期權模型:
var Sequelize = require('sequelize');
module.exports = function(sequelize, DataTypes) {
var Option = sequelize.define('Option', {
option_id: {
type: Sequelize.STRING,
primaryKey: true
},
question_id: {
type: Sequelize.STRING,
allowNull: true
},
option_description: {
type: Sequelize.STRING,
allowNull: true
},
option_type: {
type: Sequelize.STRING,
allowNull: true
}
},{
classMethods: {
}
});
return Option;
};
當我嘗試檢索數據
router.get('/:task_id', function(req, res) {
models.Task.findOne({
where: {
task_id: req.params.task_id
},
include: [ models.Question ]
}).then(function(task) {
res.json(task);
});
});
我得到的任務和問題之間的關聯。當我單獨檢索問題時,我會看到它下面的選項。但似乎無法立即檢索全部。
這是可能的。讓我知道是否按照這種格式設計數據庫的正確方法。
我需要一個任務來包含多個問題,同一個問題可以出現在多個任務中。每個問題應該包含多個選項。
它的工作。非常感謝。 :) –